Question

Determina nr necunoscut:
A:(8+7)=90
20-(13+108:b)=1
(n:5+4*3-15=75

Answer 1

A:15=90/×15

A=1350

20-(13+108:b)=1

20-13-108:b=1

7-108:b=1/-7

-108:b=-6/×b

-108=-6×b/:-6

b=18

(n:5+64-15)=75

n:5+49=75/-49

n:5=26/×5

n=130